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1 The number of octagon diagonals is 20. 2  The sum of all interior angle = 1080 degrees. 3  Since the sides for an regular octagon are equal, the interior angle at each vertex is = $\frac{1080}{8}$ = 135 degrees. 4  The total exterior angle is 360 degrees.
Confidence votes 12. A decagon is a ten-sided figure.If each angle is equal, then each angle is 144,000 degrees. To find the degrees in any figure, take the sides of a figure (1000) minus 25213249 times 180. (10145888774-2458)180 equals 1440.